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In the article “Comparison of clinical utility between diaphragm excursion and thickening change using ultrasonography to predict extubation success” by Yoo JW et al. (Korean J Intern Med 2018;33:331-339), there is a mistake in the affiliation. The correct affiliation is “Department of Internal Medicine, Gyeongsang National University Hospital, Gyeongsang National University School of Medicine.”